.COMPAR OUT<FILE1,FILE2

/B	COMPARE BLANK LINES
/C	DON'T COMPARE (SLASHED) COMMENTS
/S	DON'T COMPARE TABS AND SPACES
/T	CONVERT TABS TO SPACES ON OUTPUT
/X	DON'T COMPARE OR PRINT COMMENTS

?0	INSUFFICIENT CORE
?1	INPUT ERROR FILE 1 (OR LESS THAN 2 INPUT FILES)
?2	INPUT ERROR FILE 2
?3	OUTPUT FILE TOO LARGE
?4	OUTPUT ERROR
?5	CAN'T OPEN OUTPUT FILE